Police tape blocked off a section of a shopping center where two people suspected of shooting two Metro officers died on June 8, 2014. (Rachel Moore/FOX5)

Las Vegas Metro police officers led people out of a Walmart near Nellis Boulevard and Stewart Avenue after two gunmen entered in the store. (FOX5 ReportIt user)

LAS VEGAS (FOX5) -

Authorities identified the person who was shot by a man and woman at the front entrance of a Walmart amid a rampage that also left two police officers dead.

On Monday, the Clark County Coroner's Office identified the bystander killed Sunday as 31-year-old Joseph Robert Wilcox of Las Vegas. The cause of his death was not immediately disclosed.

According to Las Vegas Metro police, Wilcox was the bystander who was shot at a Walmart in the 300 block of North Nellis Boulevard near Stewart Avenue late Sunday morning.

Police said Wilcox was gunned down by a couple who had just opened fire on two police officers at a nearby Cici's Pizza moments earlier.

According to Metro Sheriff Doug Gillespie, the man and woman walked into the restaurant and shot two Metro officers who were eating lunch.

Gillespie identified the two officers as Officer Igor Soldo, 31, and Officer Alyn Beck, 41. Gillespie noted one of the officers was able to return fire in the incident.

The suspects took the wounded officers' weapons and ammunition with them before fleeing, Assistant Sheriff Kevin McMahill added.

Citing witnesses, McMahill stated the suspects shouted, "Tell the police the revolution has begun," as they exited the eatery. Metro Sheriff Doug Gillespie later said the proclamation was not confirmed.

Gillespie said the pair then ran over to the Walmart, where the suspects shot and killed Wilcox at the front entrance of the store.

The shooting prompted SWAT officers to be called as the suspects moved to the back of the store.

According to Gillespie, arriving officers exchanged fire with the two suspects inside the Walmart. Police said another round of shots were heard in the store that appeared to result in the suspects' deaths.

Gillespie said the female suspect appeared to have shot the other male suspect before turning a weapon on herself.

The two wounded officers were rushed to University Medical Center, where they were pronounced dead.

Authorities have not yet identified the two suspects.

Gillespie said officers doubled up on their patrols while they investigate whether a group was responsible for the attack.

In a briefing with media late Sunday afternoon, Gillespie's tone was solemn as he delivered details of the shooting.

"My officers were simply having lunch," the sheriff told reporters.

Gillespie then concluded the briefing addressing his officers.

"It's a tragic day. It's a very, very difficult day," a shaken Gillespie said. "But, we still have a community to police. We still have a community to protect ... It is a tragic day in the Las Vegas Valley."

According to police, Beck and Soldo were assigned to the Patrol Division, Northeast Area Command. Beck joined Metro in 2001 while Soldo was hired with the department in 2006.

Beck left behind a wife and three children. Soldo is survived by a wife and a baby, police said.